Uncertainties test Flashcards
(14 cards)
Resolution
The smallest measuring interval / source of uncertainty in a single reading
Uncertainty - single reading
(Resolution/2)
Uncertainty - multiple readings
(Range from lowest to highest value)/2=
Validity
Valid if it measuring what it is supposed to be measuring, dependent on insturments and method
True value
Value obtained in an ideal measurement
Accuracy
Accurate if close to true value
Precision
The closeness of agreement between values obtained by a repeated measurement
Repeatability
When measurement results obtained by people using the same operators and apparatus obtain similar results.
reproducibility
When measurement results obtained by different operators using different apparatus obtain similar results
Error
The difference between the measurement result and the true value (if the true value is a value to exist)
Systematic error
Systematic errors affect all measurements by the same amount
- systematic error measurements may be precise but inaccurate
Random error
An error in measurement caused by factors which vary from one measurement to another
- Random error measurements may be accurate but not precise
Absolute uncertainty
the resolution /2, representing the range of uncertainty.
fractional/decimal/percentage uncertainty
They show the proportion between uncertainty and measurement.
- uncertainty divide measurement * 100
